We introduced jQuery UI to Cotonti in purpose of standardization: to have a solid toolkit for making widgets and using effects. But unfortunately the library quality is below our expectations for 3 reasons:
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Bandwidth. This is mostly solved by using a new resource compression tool.

Inferiority. In fact the toolkit is incomplete and you still need a lot of third-party widgets.

Instability. Currently there is a hundred of unfixed bugs and yet more to come. I tried using 1.6rc6 and it is even worse than 1.6rc5.

I'm very disappointed about this, but seems like we have to get rid of jQuery UI until it gets a proper quality.